xmlattributesimpl.java

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     * 
     * @return the name of a duplicate attribute found in the search,
     * otherwise null.
     */
    public QName checkDuplicatesNS() {
        // If the list is small check for duplicates using pairwise comparison.
        if (fLength <= SIZE_LIMIT) {
            for (int i = 0; i < fLength - 1; ++i) {
                Attribute att1 = fAttributes[i];
                for (int j = i + 1; j < fLength; ++j) {
                    Attribute att2 = fAttributes[j];
                    if (att1.name.localpart == att2.name.localpart &&
                        att1.name.uri == att2.name.uri) {
                        return att2.name;       
                    }
                }
            }
        }
        // If the list is large check duplicates using a hash table.
        else {
            // We don't want this table view to be read if someone calls 
            // addAttribute so we invalidate it up front.
            fIsTableViewConsistent = false;

            prepareTableView();

            Attribute attr;
            int bucket;

            for (int i = fLength - 1; i >= 0; --i) {
                attr = fAttributes[i];
                bucket = getTableViewBucket(attr.name.localpart, attr.name.uri);
                
                // The chain is stale. 
                // This must be a unique attribute.
                if (fAttributeTableViewChainState[bucket] != fLargeCount) {
                    fAttributeTableViewChainState[bucket] = fLargeCount;
                    attr.next = null;
                    fAttributeTableView[bucket] = attr;
                } 
                // This chain is active. 
                // We need to check if any of the attributes has the same name.
                else {
                    // Search the table.
                    Attribute found = fAttributeTableView[bucket];
                    while (found != null) {
                        if (found.name.localpart == attr.name.localpart &&
                            found.name.uri == attr.name.uri) {
                            return attr.name;
                        }
                        found = found.next;
                    }
                    
                    // Update table view
                    attr.next = fAttributeTableView[bucket];
                    fAttributeTableView[bucket] = attr;
                }
            }
        }
        return null;
    }
    
    /**
     * Look up the index of an attribute by Namespace name.
     * <p>
     * <strong>Note:</strong> 
     * This method uses reference comparison, and thus should
     * only be used internally. We cannot use this method in any
     * code exposed to users as they may not pass in unique strings.
     *
     * @param uri The Namespace URI, or null if
     *        the name has no Namespace URI.
     * @param localName The attribute's local name.
     * @return The index of the attribute, or -1 if it does not
     *         appear in the list.
     */
    public int getIndexFast(String uri, String localPart) {
        for (int i = 0; i < fLength; ++i) {
            Attribute attribute = fAttributes[i];
            if (attribute.name.localpart == localPart && 
                attribute.name.uri == uri) {
                return i;
            }
        }
        return -1;
    } // getIndexFast(String,String):int

    /**
     * Returns the value passed in or NMTOKEN if it's an enumerated type.
     * 
     * @param type attribute type
     * @return the value passed in or NMTOKEN if it's an enumerated type.
     */
    private String getReportableType(String type) {

        if (type.charAt(0) == '(') {
            return "NMTOKEN";
        }
        return type;
    }
    
    /**
     * Returns the position in the table view 
     * where the given attribute name would be hashed.
     * 
     * @param qname the attribute name
     * @return the position in the table view where the given attribute
     * would be hashed
     */
    protected int getTableViewBucket(String qname) {
        return (qname.hashCode() & 0x7FFFFFFF) % fTableViewBuckets;
    }
    
    /**
     * Returns the position in the table view
     * where the given attribute name would be hashed.
     * 
     * @param localpart the local part of the attribute
     * @param uri the namespace name of the attribute
     * @return the position in the table view where the given attribute
     * would be hashed
     */
    protected int getTableViewBucket(String localpart, String uri) {
        if (uri == null) {
            return (localpart.hashCode() & 0x7FFFFFFF) % fTableViewBuckets;
        }
        else {
            return ((localpart.hashCode() + uri.hashCode()) 
               & 0x7FFFFFFF) % fTableViewBuckets;
        }
    }
    
    /**
     * Purges all elements from the table view.
     */
    protected void cleanTableView() {
        if (++fLargeCount < 0) {
            // Overflow. We actually need to visit the chain state array.
            if (fAttributeTableViewChainState != null) {
                for (int i = fTableViewBuckets - 1; i >= 0; --i) {
                    fAttributeTableViewChainState[i] = 0;
                } 
            }
            fLargeCount = 1;
        }
    }
    
    /**
     * Prepares the table view of the attributes list for use.
     */
    protected void prepareTableView() {
        if (fAttributeTableView == null) {
            fAttributeTableView = new Attribute[fTableViewBuckets];
            fAttributeTableViewChainState = new int[fTableViewBuckets];
        }
        else {
            cleanTableView();
        }
    }
    
    /**
     * Prepares the table view of the attributes list for use,
     * and populates it with the attributes which have been
     * previously read.
     */
    protected void prepareAndPopulateTableView() {
        prepareTableView();
        // Need to populate the hash table with the attributes we've scanned so far.
        Attribute attr;
        int bucket;
        for (int i = 0; i < fLength; ++i) {
            attr = fAttributes[i];
            bucket = getTableViewBucket(attr.name.rawname);
            if (fAttributeTableViewChainState[bucket] != fLargeCount) {
                fAttributeTableViewChainState[bucket] = fLargeCount;
                attr.next = null;
                fAttributeTableView[bucket] = attr;
            } 
            else {
                // Update table view
                attr.next = fAttributeTableView[bucket];
                fAttributeTableView[bucket] = attr;
            }
        }
    }


    /**
     * Returns the prefix of the attribute at the specified index.
     *
     * @param index The index of the attribute.
     */
    public String getPrefix(int index) {
        if (index < 0 || index >= fLength) {
            return null;
        }
        String prefix = fAttributes[index].name.prefix;
        // REVISIT: The empty string is not entered in the symbol table!
        return prefix != null ? prefix : "";
    } // getPrefix(int):String

    /**
     * Look up an attribute's Namespace URI by index.
     *
     * @param index The attribute index (zero-based).
     * @return The Namespace URI
     * @see #getLength
     */
    public String getURI(int index) {
        if (index < 0 || index >= fLength) {
            return null;
        }
        String uri = fAttributes[index].name.uri;
        return uri;                        
    } // getURI(int):String

    /**
     * Look up an attribute's value by Namespace name.
     *
     * <p>See {@link #getValue(int) getValue(int)} for a description
     * of the possible values.</p>
     *
     * @param uri The Namespace URI, or null if the
     * @param localName The local name of the attribute.
     * @return The attribute value as a string, or null if the
     *         attribute is not in the list.
     */
    public String getValue(String uri, String localName) {
        int index = getIndex(uri, localName);
        return index != -1 ? getValue(index) : null;
    } // getValue(String,String):String


    /**
     * Look up an augmentations by Namespace name.
     *
     * @param uri The Namespace URI, or null if the
     * @param localName The local name of the attribute.
     * @return Augmentations     
     */
    public Augmentations getAugmentations (String uri, String localName) {
        int index = getIndex(uri, localName);
        return index != -1 ? fAttributes[index].augs : null;
    }

    /**
     * Look up an augmentation by XML 1.0 qualified name.
     * <p>
     *
     * @param qName The XML 1.0 qualified name.
     *
     * @return Augmentations
     *
     */
    public Augmentations getAugmentations(String qName){
        int index = getIndex(qName);
        return index != -1 ? fAttributes[index].augs : null;
    }



    /**
     * Look up an augmentations by attributes index.
     * 
     * @param attributeIndex The attribute index.
     * @return Augmentations
     */
    public Augmentations getAugmentations (int attributeIndex){
        if (attributeIndex < 0 || attributeIndex >= fLength) {
            return null;
        }
        return fAttributes[attributeIndex].augs;
    }

    /**
     * Sets the augmentations of the attribute at the specified index.
     * 
     * @param attrIndex The attribute index.
     * @param augs      The augmentations.
     */
    public void setAugmentations(int attrIndex, Augmentations augs) {
        fAttributes[attrIndex].augs = augs;
    }

    /**
     * Sets the uri of the attribute at the specified index.
     * 
     * @param attrIndex The attribute index.
     * @param uri       Namespace uri
     */
    public void setURI(int attrIndex, String uri) {
        fAttributes[attrIndex].name.uri = uri;
    } // getURI(int,QName)
    
    // Implementation methods
    public void setSchemaId(int attrIndex, boolean schemaId) {
        fAttributes[attrIndex].schemaId = schemaId;
    }
    
    public boolean getSchemaId(int index) {
        if (index < 0 || index >= fLength) {
            return false;
        }
        return fAttributes[index].schemaId;
    }
    
    public boolean getSchemaId(String qname) {
        int index = getIndex(qname);
        return index != -1 ? fAttributes[index].schemaId : false; 
    } // getType(String):String
    
    public boolean getSchemaId(String uri, String localName) {
        if (!fNamespaces) {
            return false;
        }
        int index = getIndex(uri, localName);
        return index != -1 ? fAttributes[index].schemaId : false;
    } // getType(String,String):String
    
    //XMLBufferListener methods
    /**
     * This method will be invoked by XMLEntityReader before ScannedEntities buffer
     * is reloaded.
     */
    public void refresh() {
        if(fLength > 0){
            for(int i = 0 ; i < fLength ; i++){
                getValue(i);
            }
        }
    }  
    public void refresh(int pos) {
	}

    //
    // Classes
    //

    /**
     * Attribute information.
     *
     * @author Andy Clark, IBM
     */
    static class Attribute {
        
        //
        // Data
        //

        // basic info

        /** Name. */
        public QName name = new QName();

        /** Type. */
        public String type;

        /** Value. */
        public String value;

        /** This will point to the ScannedEntities buffer.*/
        public XMLString xmlValue;
        
        /** Non-normalized value. */
        public String nonNormalizedValue;

        /** Specified. */
        public boolean specified;
        
        /** Schema ID type. */
        public boolean schemaId;
        
        /** 
         * Augmentations information for this attribute.
         * XMLAttributes has no knowledge if any augmentations
         * were attached to Augmentations.
         */
        public Augmentations augs = new AugmentationsImpl();
        
        // Additional data for attribute table view
        
        /** Pointer to the next attribute in the chain. **/
        public Attribute next;
        
    } // class Attribute

} // class XMLAttributesImpl